You probably won't notice any difference by fitting a stub-stack. They come into their own at very high flow rates which equals very high revs.
The idea of them is to smooth out the flow into the carb by, effectively, making the carb entry throat longer thus allowing the flow to become stable before it gets to the butterfly valve and carb needle. The higher the speed of the inlet air the longer the throat it needs to 'settle down' and become smooth.
At lower revs it is only necessary to put a generous radius on the carb inlet mouth, say 4 mm radius and make sure the surface of the carb mouth is smooth.
On some full race engines a very long inlet stack is fitted due to the ultra-high revs being used and the consequently much higher inlet volume of air.